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I found a male nude reference.

Bluephoto 藍攝 No.25
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And it seems that these are male nude references too.
https://www.yunpanjingling.com/resources/5c9b36a74b3f415b622a400b
https://www.yunpanjingling.com/resources/5c9b396d4b3f41032b55e07d

Can you get these links, mildsnow?